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Improve startup performance of DevTools by starting fileSystemWatcher async #50898

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@AB-xdev

While debugging I noticed that ClassPathFileSystemWatcher#afterPropertiesSet spends a lot of time launching the fileSystemWatcher.

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This could be optimized by starting the fileSystemWatcher async (similar to how this is done with spring.jpa.bootstrap) or maybe utilizing the Watcher Thread for the initial FileSystem work.

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